Girt-pin connection for gang saws



Feb. 15

F. s. F LOETER GIRT PIN CONNECTION FOR GANG SAWS 2 Sheets-Sheet 1 FiledMarch 2. 1925 ha II drmkmry 1927. Feb 15 F. s. FLOETER GIRT PINCONNECTION FOR GANG SAW$ 2 sheets-sneak 2 Filed March 1925 .FIG.3

ATTORNEY Patented Feb. 15, 1927.

UNITED STATES PATENT OFFICE.

FREDERICK S. FLOETER, OF SAGINAW, MICHIGAN, ASSIGNOR TO WICKES BROTHERS,A CORPORATION OF MICHIGAN.

GIRT-PIN CONNECTION FOR GANG SAWS.

Application filed March 2, 1925.

This invention relates to gang saws and pertains to an improvedconstruction of the saw-carrying frame or sash, which, as usual, isreciprocatcd vertically by means of a crank and pitman.

More specifically my improvement has to do with the arrangement of thelower girt or member of the sash that forms the journal bearingconnection for the pitman.

An object of the present invention is to cheapen the cost of manufactureby reducing the amount of labor required in forming the lower girt pin,and also by making the girt pin removable to permit a cheaper andsimpler form of top pitman bearing to be employed.

Another object is to provide means for adequately lubricating the pitmanbearing, also the laterally projecting trunnions or horns that carry theguide-blocks which sl de up-and-down in the frame of the machine whileguiding the sash in its rapid reclproeating movement.

Heretofore it has been customary to hew the girt pin out of the solidmetal that forms the bottom cross member of the reciprocating sash. Thismember usually consisted of a steel forging comprising a flat web boltedto the sash, and a massive lower edge which was shaped by hand to formthe girt pin bearing. This pin was usually integral with the web andconsequently the pitman bearing had to be made 1n halves in order toenable it to be assembled on the pin. The bearing, therefore, usuallyconsisted of a strap, gib and key, with a divided or two-piece bronzebox; a very expensive construction and not a very accurate bearingsurface.

In my improved device I make the girt pin removable and inconsequencecan employ a pitman having an upper bearing made in onepiece, and having a turned bronze bushing with a compression slot foradjustment; a cheap and efiicient construction.

This improved girt pin is not only renewable in case of wear, but alsois a reservoir for lubricant, enclosed within the tubular member of thelower girt.

Formerly the oiling of the pitman and central girt pin bearing wasaccomplished by bolting an oil reservoir to the girt and piping the oilto the bearing. This reservoir had to be very strong and heavy, becausein the operation of the gang saw the Serial No. 12,732.

girt pin itself constitutes the reservoir forlubricant.

With the foregoing and certain other objects in View, which will appearlater in the specification, my invention comprises the devices describedand claimed and the equivalents thereof.

In the drawings, Fig. 1 is a side view of a part of a gang saw embodyingmy improvement.

Fig. 2 is a front view of the reciprocating sash.

Fig. 3 is a side view. I

Fig. 4 is a section on the line H of Fig. 2.

As is clearly shown in the drawings, the gang saw consists in the usualframe 1 carrying feed rolls 2 and saws 3. The saws are mounted in theusual sash having stiles 4 tied together by cross braces as shown inFigs. 2, 3 and 4. The lower ends of the sawsare secured in any usualmanner to the Ii-head slot, 5, in the web 6 of the lower girt.

As is usual in gang saws, the stile 4L of the sash is guided in itsreciprocating movement by slidable guide blocks 7 usually of wood,carried by the outwardly projecting trunnions or orns 8. The guideblocks 7 run in suitable ways 9 carried by the frame.

At the lower end of the girt web 6 and preferably integral therewith isa pair of tubular members 10, 10, spaced apart endwise, as at 11, toreceive between them the upper pitman bearing 12.

The hollow tubular girt pin 13, which may be of hardened steel,accurately ground, extends through both members 10, 10, and the guideblock horns 8 are secured to its outer ends. Preferably the ends of thegirt pin are counterbored to receive the horns, and a tapered lockingpin 14: is passed through the tubular member 10, girt pin 13 and horn 8,firmly fixing the parts as shown in Fig: 3.

Each horn is formed with a longitudinal lubricant channel 15 connectingthe interior of the girt pin 13 with the external bearing surface of thehorn 8, thus lubricating the rubbing surfaces of the horn in guide block7. The interior of the girt pin may be supplied with lubricant by meansof a filler tube and cap 16, and lubricant delivery openings 17 areprovided through the wall of the girt pin near the middle of its lengthfor supplying lubricant to the rubbing surfaces of the pitman bearing12.

The pitman bearing 12 can now be made, as previously stated, with a.one-piece turned bronze bushing having a compression slot, the head ofthe pitman being slitteol, so as to be tightened by a clamping bolt, asis usual in bearings of this kind. The use of this type of bearing,however, is made possible only by the removable girt pin 13, for thereasons previously given.

To prevent too violent splashing and consequent excessive rate of oilfeed to the rubbing surfaces I prefer to employ fibre wicks 18 in thevarious lubricant delivery channels and openings.

I secure satisfactory lubrication and avoid the use of the heavycontainer for lubricant heretofore employed and I also secure lightnesswithout impairing strength, by making the girt pin 13 hollow andutilizing it as an oil reservoir which not only furnishes directlubrication to the pitman bearing, but

. also to the two horn bearings.

Having thus described my invention what I claim and desire to secure byLetters Patent is:

1. A lower girt for a gang saw sash,'comprising in combination, a webhaving a sawengaging head at its upper edge and a pair of tubularmembers, spaced apart, at its lower end, a tubular girt pin within saidtubular members and spanning the space be tween them, laterallyprojecting guide-block horns fixed in the ends of said girt pin, eachhorn formed with an oil channel connecting the interior of the girt pinwith the external bearing surface of the horn, means forsupplyinglubricant to the interior of said girt pin, and lubricant deliveryopenings through the wall of said girt pin.

2. A lower girt for a gang saw sash comprising in combination a webhaving a pair of integral tubular members, spaced apart, at its lowerend, a removable tubular girt pin within said tubular members, laterallyprojecting guide-block horns removably secured in the ends of said girtpin, each horn formed with a longitudinal lubricant channel, means forsupplying lubricant to the intcrior of said girt pin andlubricant-delivery openings through the wall of said girt pin near themiddle of its length.

3. In combination with a gang saw having a reciprocating sash and apitman, a flat web having at its lower end a pair of tubular membersspaced apart to receive a bearing of said pitman between them, a tubulargirt pin within said tubular members, laterally projecting guide-blockhorns forming closures for the ends of said girt pin, each horn formedwith a lubricant channel, lubri cant delivery openings through the wallof said girt pin to said pitman bearing, and means for supplyinglubricant to the interior of said girt pin- 4. In combination, a lowergirt for a gang saw sash having a pair of tubular members spaced apartto receive a pitman bearing, a tubular girt pin within said tubularmembers, laterally projecting guide block horns on the ends of said girtpin, means for supplying lubricant to the interior of said tubular girtpin and means for feeding lubricant therefrom to the external surfacesof the guide block horns and to said pitman bear ing during theoperation of the sash.

In testmony whereof I aflix my signature.

FREDERICK S. FLOETER.

